Flettner Rotor Sample Clauses

Flettner Rotor. A Flettner Rotor is a rotating cylinder, which generates a force perpendicular to the flow of whatever fluid it is in (in this case air). The cylinder generates this lift due to a pressure change across the surface caused by the interaction of the fluid flow and cylinder rotation. The background of these is discussed in detail in WP1. A simple diagram of lift and drag forces felt by a Flettner Rotor is given in Figure 73. Figure 73: Flettner Rotor, with lift and drag forces. Note all is in the frame of reference of the rotor. (Oreada, 2005) The Lift force, which is the primary force in this process, can be calculated using Where; ρ = Density of fluid [kg m−3] U = Speed of fluid in the frame of reference of the cylinder [ms-1] A = Cross sectional area [m2] CL= Coefficient of lift [-] The density of air varies according to temperature. For example, at 30°C the density will be 1.1644 kg m−3 whereas at -25°C the density is 1.4224 kg m−3. This change of density of 16% will result in a reduction of 16% in the drag and lift forces. The drag forces can be calculated as: Where; ρ = Density of fluid [kg m−3] U = Speed of fluid in the frame of reference of the cylinder [ms-1] A = Cross sectional area [m2] CD= Coefficient of drag [-] The vectors of these two forces will give a final force and direction with respect to the fluid flow in the frame of reference of the cylinder. The Coefficient of Lift can be calculated for a simplified model in an inviscid fluid as; Where;
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